#ifndef crypto_hash_sha512_H
#define crypto_hash_sha512_H

/*
 * WARNING: Unless you absolutely need to use SHA512 for interoperatibility,
 * purposes, you might want to consider crypto_generichash() instead.
 * Unlike SHA512, crypto_generichash() is not vulnerable to length
 * extension attacks.
 */

#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>

#include <sodium/export.h>

#ifdef __cplusplus
#ifdef __GNUC__
#pragma GCC diagnostic ignored "-Wlong-long"
#endif
extern "C"
{
#endif

  typedef struct crypto_hash_sha512_state
  {
    uint64_t state[8];
    uint64_t count[2];
    uint8_t buf[128];
  } crypto_hash_sha512_state;

  SODIUM_EXPORT
  size_t
  crypto_hash_sha512_statebytes(void);

#define crypto_hash_sha512_BYTES 64U
  SODIUM_EXPORT
  size_t
  crypto_hash_sha512_bytes(void);

  SODIUM_EXPORT
  int
  crypto_hash_sha512(unsigned char *out, const unsigned char *in,
                     unsigned long long inlen);

  SODIUM_EXPORT
  int
  crypto_hash_sha512_init(crypto_hash_sha512_state *state);

  SODIUM_EXPORT
  int
  crypto_hash_sha512_update(crypto_hash_sha512_state *state,
                            const unsigned char *in, unsigned long long inlen);

  SODIUM_EXPORT
  int
  crypto_hash_sha512_final(crypto_hash_sha512_state *state, unsigned char *out);

#ifdef __cplusplus
}
#endif

#endif
